Structural study of ball-milled sodium alanate under high pressure

被引：4

作者：

Vennila, R. Selva ^{[1
]}

Drozd, Vadym ^{[1
]}

George, Lyci ^{[1
]}

Saxena, Surendra K. ^{[1
]}

Liermann, Hanns-Peter ^{[2
,3
]}

Liu, H. Z. ^{[4
]}

Stowe, Ashley C. ^{[5
]}

Berseth, Polly ^{[5
]}

Anton, Donald ^{[5
]}

Zidan, Ragaiy ^{[5
]}

机构：

[1] Florida Int Univ, Ctr Study Matter Extreme Condit, Miami, FL 33199 USA

[2] Argonne Natl Lab, Adv Photon Source, HPCAT, Argonne, IL 60439 USA

[3] Argonne Natl Lab, Adv Photon Source, Geophys Lab, Argonne, IL 60439 USA

[4] Carnegie Inst Sci, HPCAT, Geophys Lab, Argonne, IL 60439 USA

[5] Energy Secur Dept, Savannah River Natl Lab, Aiken, SC 29808 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 473卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

Hydrogen absorbing materials; Phase transitions; Crystal structure; Strain; High pressure; X-ray diffraction; X-RAY-DIFFRACTION; HYDROGEN STORAGE; PHASE-TRANSFORMATIONS; DECOMPOSITION; SPECTROSCOPY; HYDRIDES; NAALH4;

D O I：

10.1016/j.jallcom.2008.06.036

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ball-milled NaAlH4 was studied up to 15 GPa in a diamond anvil cell (DAC) by X-ray diffraction using a synchrotron radiation source. Lattice parameters were determined from the X-ray diffraction data at various pressures up to 6.5 GPa. Intensity of the powder diffraction patterns decreased with increasing pressure. Amorphisation started at a pressure of similar to 6.5 GPa and completed at 13.5 GPa. Reversible phase transformation from amorphous phase to the tetragonal phase was observed. A fit to the pressure-volume data equation of state was obtained using the Birch-Murnaghan equation of state and the bulk modulus was found to be 52.16 +/- 0.9 GPa which is twice higher than the unmilled NaAlH4. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：576 / 578

页数：3

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